Pneumatic butterfly valves are used for controlling solid materials and are often employed as discharge valves at the bottom of tanks, such as those of cement tanks and stone powder tanks. They are used for discharging materials and quickly cutting off the flow. Since most dusty materials contain particles of various sizes, the wear on the valve sealing surface is inevitable. Incorrect selection can significantly reduce the service life of the valve or cause internal leakage very quickly, thereby affecting its continued use. 

The weighing system for ingredients realizes fully automatic control throughout the entire ingredient dispensing process using PLC. The discharge valve of the ingredient cart is a pneumatic three-bias eccentric butterfly valve, and the medium is very fine stone powder. After using it for some time, the valve began to leak internally, causing the stone powder to frequently spill in piles on the workbench. This is because this medium is very fine and somewhat sticky. Although the ingredient cart is equipped with a vibration motor, there are still many materials adhering to the tank wall and the valve area. When the valve is closed, it gets stuck around the sealing surface, preventing the valve from closing. As a result, leakage occurs when adding new materials, and over time, the sealing surface is severely worn and even develops grooves. 

Installation and maintenance of pneumatic butterfly valves: 

1. When installing pneumatic butterfly valve, attention should be paid to the flow mark on the valve body to avoid the wrong flow direction and affect the use. 

2. Before using the pneumatic butterfly valve, it is necessary to ensure that the valve is fully open and then conduct a thorough flushing of the pipeline to prevent any debris such as welding slag from scratching the sealing surface. 

3. Most pneumatic butterfly valves are equipped with a bypass pipeline. During maintenance or replacement of the pneumatic butterfly valve, the bypass pipeline can be used to continue the process as usual. 

4. The pneumatic butterfly valve can be installed horizontally within a 180° range in a vertical position. Do not install the pneumatic actuator upside down. 

5. The positioning device or solenoid valve debugging details are provided in the manual. 

6. The curved arm of the pneumatic actuator is of a square head structure and is used as a manual device. In case of failure, the air supply pipe can be removed and manual operation can be achieved simply by using a manual wrench. 

7. During use, if you find that the stuffing box is leaking, simply tighten the gland bolts to solve the problem.